硝化棉冲孔和切割工艺的热机械行为有限元分析OA

To address thermo-mechanical coupling behavior in high-risk nitrocellulose processing operations such as punching and cutting,we established a finite element analysis framework integrating a 3D transient temperature field with a Johnson-Cook constitutive model,overcoming the applicability limitations of traditional metal machining models for energetic materials.By establishing a unified multi-process simulation framework,we quantitatively revealed the dynamic impact mechanisms of frictional heat and plastic deformation heat on temperature/stress fields:localized heat accumulation during punching caused a 12.1℃temperature rise and 52.1 MPa peak stress;high strain rates and complex tool motion during cutting resulted in a peak temperature of 80.7℃and a peak stress of 154.4 MPa.Demonstrating that thermo-mechanical responses in both processes remain within nitrocellulose's safety thresholds,we validated the feasibility of high-speed parameters of punching speed 3 000 mm/s and cutting speed 300 r/min.